如何在Java中进行列表理解

Question

I'm writing a program and I want to shorten the code through list comprehension (like those in Python). However, I faced syntax errors while trying to simplify the code:

I've attempted to troubleshoot this problem multiple times, but all the solutions they proposed are through ArrayLists while I want to complete this task in the form of an integer array (int[]).

boolean[][] seats;
Theater(int row, int col) {
    for (int i=0; i<row; i++) for (int j=0; j<col; j++) seats[i][j] = false;
}

public int[] findSeats(int row) {
    int[] arr = [x for (boolean x : this.seats[row]) if (x == false)];
    return arr;
}

I expected the code above to work but the following messages showed up instead:

Syntax error on tokens, delete these tokens
Syntax error on token "]", delete this token

Can anyone please help? Much appreciated.

Answer 1

This language construct of Python is not available in Java. I assume you are finding vacant seats in a row? The closest I thought will be something like this

public int[] findSeats(int row) {

        final int[] avSeats = new int[seats[row].length];
        IntStream.range(0, seats[row].length).filter(seatNo -> !seats[row][seatNo]).forEach(seatNo -> avSeats[seatNo] = 1);
        return avSeats;

    }